Abstract: A dock assembly includes a first and a second dock sidewall joined via a first vertical receiver tube positioned between adjacent ends of the first dock sidewall and the second dock sidewall. A third dock sidewall is joined with the second dock sidewall via a second vertical receiver tube positioned between adjacent ends of the second dock sidewall and the third dock sidewall. A fourth and a fifth dock sidewalls are joined via a third vertical receiver tube positioned between adjacent ends of the fourth dock sidewall and the fifth dock sidewall. The second and the fifth dock sidewalls are positioned side by side such that respective sides of the first and third receiver tubes are abutting each other. The first and third receiver tubes are securely joined by inserting respective upper and lower connector keys dimensioned to fit into respective sockets of the first and third receiver tubes.